<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        .clock{
            width: 300px;
            height: 300px;
            border: 10px solid #ccc;
            /*border-radius: 160px;*/
            /*百分比参照元素的实际宽高*/
            border-radius: 50%;
            margin:100px auto;
            position: relative;
        }
        .line{
            width: 8px;
            height: 300px;
            background-color: #ccc;
            position: absolute;
            /*参照父容器的宽*/
            left: 50%;
            top:0;
            /*参照元素本身*/
            transform: translate(-50%,0);
        }
        .line1,.line4{
            width: 10px;
        }
        .line2{
            transform: translate(-50%,0) rotate(30deg);
        }
        .line3{
            transform: translate(-50%,0) rotate(60deg);
        }
        .line4{
            transform: translate(-50%,0) rotate(90deg);
        }
        .line5{
            transform: translate(-50%,0) rotate(120deg);
        }
        .line6{
            transform: translate(-50%,0) rotate(150deg);
        }
        .cover{
            width: 250px;
            height: 250px;
            border-radius: 50%;
            background-color: #fff;
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%,-50%);
        }
        .hour{
            width: 6px;
            height: 80px;
            background-color: red;
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%,-100%);
            transform-origin: center bottom;
            animation: clockAnimation 43200s linear infinite;
        }
        .minute{
            width: 4px;
            height: 90px;
            background-color: green;
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%,-100%);
            transform-origin: center bottom;
            animation: clockAnimation 3600s linear infinite;
        }
        .second{
            width: 2px;
            height: 100px;
            background-color: blue;
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%,-100%);

            /*设置旋转轴心*/
            transform-origin: center bottom;
            /*添加动画*/
            animation: clockAnimation 60s infinite steps(60);
            /*steps(60)与animation-timing-function的其它属性冲突*/
            /*animation-timing-function: steps(60);*/
        }
        .center{
            width: 20px;
            height: 20px;
            background-color: #ccc;
            border-radius: 50%;
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%,-50%);
        }

        /*创建动画*/
        @keyframes clockAnimation {
            from{
                transform:translate(-50%,-100%) rotate(0deg);
            }
            to{
                transform:translate(-50%,-100%) rotate(360deg);
            }
        }
    </style>
</head>
<body>
<div class="clock">
    <div class="line line1"></div>
    <div class="line line2"></div>
    <div class="line line3"></div>
    <div class="line line4"></div>
    <div class="line line5"></div>
    <div class="line line6"></div>
    <div class="cover"></div>
    <div class="hour"></div>
    <div class="minute"></div>
    <div class="second"></div>
    <div class="center"></div>
</div>
</body>
</html>